I thought a lot about these 5 circles. I think I found them, but not sure if I found the correct ones. Here are the circles I found for N=27 MAX:
In fact, my circles are a little bit different.
Here is our Max27:
333333332223333223222334334
333323323232323231233333433
343322332222222222333233342
233333332222222222213323343
323322222222222222222323332
233332222222222212222123332
332322221222212222222222233
333212222220000222222223223
322122222200000002122212233
321222221000000000022222232
332222220000000000022222232
322222201000000000022222223
222222200000000000002222233
222222200000000000002222222
312222200000000000002222223
222222200000000000002212222
332222220000000000022212233
232222210000000000022222323
222222222000000000222222222
323222222220000222222223332
322322222212222222222222333
233332222222222212222233322
432333222222122222222223223
333332322222221221223332333
233333333222222222323233234
334332331322222233323333334
433432333223333233223233333